rendering without light only texture as they are
I'm not sure if you're trying to do this. Here's my solution:




Hide all lights in your scene by selecting lights and pressing H.
Set your world to white. If there's no color selection, you may check "Use Nodes" to create nodes before you change the world color.





Use Node Wrangler. It's a built-in plug-in. Ctrl+Alt+U to call User Preferences. Go to Addons and search "Node Wrangler", and tick it, then save user settings. 
Go to Node Editor, and build up your materials for the object. Once finished, you want to make a solo preview of your texture, so press Ctrl+Shift+LMB on an image node of your diffuse BSDF to make it solo in preview.



(The dotted line was the original line in final, but I make a solo preview of the texture, as you can see the Material Output receives input from a Viewer, followed with Image node.)


Render, or make a viewport render, by Shift+Z.




Alternatively, You can also make screenshots in Material viewport.



Hope that helps.